That they are, lara. But right to the alarming threats of war coming out of north korea this morning. Abc's martha raddatz is there in seoul, south korea, whe she's tracking the latest. Good morning, martha. Reporter: Good morning, robin. South korea is saying this morning that north korea, just 25 or 30 miles from here, has moved one of its missiles to the east coast, a missile with considerable range. The moment of explosion is approaching. That's the looming threat this morning from north korea saying they have the final approval to launch, quote, merciless military strikes on the united states involving the possible use of cutting-edge nuclear weapons. Some of the actions they've taken over the last few weeks present a real and clear danger and threat to the interests of certainly our allies. Reporter: Now the u.S. Is matching those threats with strategic deployments. The missiles do not have the range to reach the u.S. Mainland, but the u.S. Is matching north korean threats with strategic deployments to the region. Mobilizie iing an advance missile defense season, the terminal high area defense battery. To protect guam and likely within range of that north korean missile. The thad system using truck interceptors. And warplanes including fighter jets, u2 spy plane and attack jets in the skies as part of a massive military exercise. This morning, including practice in case of a chemical weapons attack. North korea has one of the largest chemical weapons stockpiles in the world. Of course, the biggest threat is a nuclear weapon or a missile. We asked the head of u.S. Forces here in south korea whether the north koreans had a nuclear weapon they could put on a missile. He said, we are not certain, but we have to take the threat seriously. Of course, if they did launch some sort of nuclear weapon, it would be suicide for the north korean leader.

This transcript has been automatically generated and may not be 100% accurate.

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